/*
 * @Author: chen haoxuan
 * @Date: 2021-05-05 15:41:31
 * @LastEditTime: 2021-05-05 22:11:49
 */
//* 使用默认参数的构造函数
#include<iostream>
using namespace std;
class Box
{
    public:
        Box(int h=10,int w=10,int len =10);
        int volume();
    private:
        int height;
        int width;
        int length;
};
Box::Box(int h,int w,int len)
{
    height =h;
    width =w;
    length =len;
}
int Box::volume()
{
    return (height*width*length);
}
int main()
{
    Box box1;
    cout<<"The volume of box1 is "<<box1.volume()<<endl;
    Box box2(15);
    cout<<"The volume of box2 is "<<box2.volume()<<endl;
    Box box3(15,30);
    cout<<"The volume of box3 is "<<box3.volume()<<endl;
    Box box4(15,30,20);
    cout<<"The volume of box4 is "<<box4.volume()<<endl;
    return 0;
}